Legend: +  positive 90-100%, - negative 90-100%, [+] positive 75-89%, [-] negative 75-89%, d positive 25-74% of strains
Genus Cedecea
Taxonomy
Morphology
Cultural characteristics
Biochemical characters
Ecology
Pathogenicity
References
Phylum Proteobacteria, Class Gammaproteobacteria, Order Enterobacteriales, Family Enterobacteriaceae, Genus Cedecea,
Cedecea davisae Grimont et al. 1981 - type species of the genus,
Cedecea lapagei Grimont et al. 1981,
Cedecea neteri Farmer et al. 1983,
“Cedecea species 3”,
“Cedecea species 5”.
Gram negative rods, 0.6–0.7 x 1.3–1.9 μm. Motile by 5-9 peritrichous flagella.
Colonies on nutrient agar are 1.5 mm in diameter (24 h, 37 °C), nonpigmented.
Facultatively anaerobic. Incubation temperature 25 – 37 °C.
Media: Trypticase Soy Agar with 5% sheep blood.
Nutrient Agar (Oxoid CM3) (beef extract 1 g, yeast extract 2 g, peptone 5 g, NaCl 5 g,
agar 15 g, distilled water 1l, pH 7,4).
Isolated from human clinical specimens (blood, sputum, wounds, gallbladder, eye, abscess, throat), feces, some parasitic
arthropods & cockroaches
Blatta germania and Blatta orientalis. Resistant to colistin, polymyxin, penicillin, ampicillin & cephalothin.
Opportunistic pathogen. Associated with infections in humans (bacteremia), one report of C. lapagei peritonitis after surgical
intervention. Appears to be a tick pathogen: females of the tick
B. microplus may be infected with Cedecea lapagei which destroys the
epithelium of the vaginal area.
  1. J. G.Holt et al., 1994. Begey’s manual of Determinative Bacteriology, 9th-edition, Williams & Wilkins.
  2. Don J. Brenner and J.J. Farmer III, 2001. Family I. Enterobacteriaceae. In:  Bergey’s Manual of Systematic Bacteriology, Second
    edition,Vol two, part B, George M. Garrity (Editor-in-Chief), pp 587-897.
  3. Grimont (P.A.D.), Ggrimont (F.), Farmer III (J.J.) and Asbury (M.A.): Cedecea davisae gen. nov., sp. nov. and Cedecea    lapagei sp.
    nov., new Enterobacteriaceae from clinical specimens. Int. J. Syst. Bacteriol., 1981, 31, 317-326;
  4. Farmer III (J.J.), Sheth (N.K.), Hudzinski (J.A.), Rose(H.D.) and Asburi (M.F.): Int. J. Syst. Bacteriol., 1983, 33, 438-440. Bacteremia
    due to Cedecea neteri sp. nov. J. Clin. Microbiol., 1982, 16, 775-778.
Positive results for nitrate reduction, methyl red, Voges–Proskauer, citrate utilization
(Simmons),lipase (corn oil,Tween 40, Tween 60, Tween 80, and tributyrin), esculin hydrolysis (most of them), acid production from: D-
glucose, D-mannitol, salicin, maltose, trehalose, cellobiose, D-arabitol, D-mannose & D-galactose.

Negative results for gelatin hydrolysis, DN-ase, chitinase, polygalacturonase, amylase, indole production, H
2S production (TSI), urea
hydrolysis, phenylalanine deaminase, lysine decarboxylase, tartrate, acid production from: dulcitol, adonitol, myo-inositol, L-arabinose,
L-rhamnose, alpha-methyl-D-glucoside, erythritol, glycerol & mucate.
(c) Costin Stoica
Antibiogram
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R E G N U M
PROKARYOTAE
 
Ornithine
decarboxylase
Malonate
utilization
Melibiose
fermentation
Raffinose
fermentation
D-Sorbitol
fermentation
Sucrose
fermentation
D-xylose
fermentation
C. davisae
+
+
-
-
-
+
+
C. lapagei
-
+
-
-
-
-
-
C. neteri
-
+
-
-
+
+
+
C. species 3
-
-
+
+
-
d
+
C. species 5
d
-
+
+
+
+
+
Differential characters between species:
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